A leaking fuel line can also be a reason your vehicle will not accelerate. The reason may be the faulty transmission or a slipping clutch or other mechanical, electrical, or other problems. 6 Reasons Your Car Wont Accelerate When Pressing The Gas Pedal I need a solution asap. When i press the gas my car won't accelerate . This can cause the vehicle to accelerate slowly, or even sputter and stall,. The rpm increases but my car wont go. To rev up and suddenly my car would jump forward with acceleration for all. When you hit the gas, most of the time it does nothing, but sometimes will go up to 900 rpms, then stall, it does the same thing in all gears. While these are far from all of the possible reasons, it’s a good start. Speaking of leaks if your vehicle has a leak in the vacuum system, you may experience an. At first the it wouldn't even rev, but the more i pushed on the pedal it did start. Reasons your car won’t accelerate. Then it starts to act up, and...